2025 SMSI Bannerklein

P2.0.6 Schottky Type Ag-TiO2 Hydrogen Sensor: Gas Sensing Mechanism and Modeling

Event
14th International Meeting on Chemical Sensors - IMCS 2012
2012-05-20 - 2012-05-23
Nürnberg/Nuremberg, Germany
Chapter
P2.0 Metal Oxide-based Sensors
Author(s)
S. Rahbarpour - Electrical Engineering Department, K. N. Toosi University of Technology (Iran), S. Hosseini-Golgoo - Electrical Engineering Department, Guilan University (Iran)
Pages
1275 - 1278
DOI
10.5162/IMCS2012/P2.0.6
ISBN
978-3-9813484-2-2
Price
free

Abstract

The use of Schottky type noble metal-metal oxide gas sensors is spreading due to their unique gas sensing properties. In this paper, hydrogen detection using Ag-TiO2-Ti diodes is reported. The I-V characteristics of these diodes are highly sensitive to the partial pressure of hydrogen contamination in the surrounding atmosphere. At the reducing atmosphere the energy barrier height established at the Ag-TiO2 junction reduces due to silver work function variation and the junction behaves as an ohmic
contact in a highly reducing atmosphere. This reversible transition from Schottky to ohmic behaviour was modelled qualitatively and quantitatively based on the hydrogen-silver interaction. The model was experimentally confirmed.

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